Monte Hellman directs this Roger Corman B-picture about a group of criminals who take refuge in an isolated cabin and find themselves face-to-face with a horrendous blood-sucking monster. The monster tracks them down and decimates the group one by one. The survivors are forced to find shelter in a haunted cave, where they engage in a death-dealing confrontation with the prehistoric mutant. Featuring Michael Forest, Frank Wolff and Sheila Carol as the criminals…who are also contending with a contentious love triangle. Hellman's exploitation thriller is low-budget fun in the truest sense of the term.